Please send code samples if you can, Thanks!
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113answers:
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            I think you need to 3d-party form control.
I found next topics about this issue:
- Is there a control which emulates Excel functionality but is not Excel?
- ASP.Net web server control that generates HTML and Excel
and much more with tags excel, control, asp.net, etc
I think the best implementation would be non-free Google: excel+reports+asp.net has a number of solutions
                  abatishchev
                   2009-04-08 19:20:01
                
              
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            The Excel 2007 format can be created without Excel, as it's just a zip file containing XML files, I've generated Word 2007 docs before on the fly and served them from a web page without Word installed.
There's an article here on CodeProject
                  Patrick McDonald
                   2009-04-08 19:40:32
                
              
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            If you're not militant about it being "an excel file" and actually mean "A file with some data I have, loaded with excel", then all you have to do is create a .csv and open it programatically with excel. It'll look the same as a 'real' excel file, mostly-kinda.
                  GWLlosa
                   2009-04-08 19:57:56